The German growing area Franconia was earlier in the three areas Maindreieck, Main square and Steigerwald structured with 23 major layers and 216 individual layers. In November 2011, a new regulation was passed by the members of the Franconian Winegrowing Association. The three old areas are replaced by 12 much smaller ones. In the medium to long term, these will replace the 23 major locations. The old areas once played a role in the predominant marketing of Franconian table wine, which they had lost for some time. Prior to this change, the Mainviereck area had the following description:
The very small area Mainviereck lies in the west and covers only about 330 hectares of vineyards. He is after the by the curved course of the Mains formed landscape in the form of a square open to the north with the cornerstone forming communities Gemünden, Wertheim, Miltenberg and Aschaffenburg. Primeval soils with mica schist, quartzite and gneiss prevail here. The most common varieties are Müller-Thurgau, Riesling, Silvaner and Bacchus. The area is in the two major locations Heiligenthal and Reuschenberg divided.